I used Rakarth Flesh as the base for my white, next it will get Agrax then Pallid Wych Flesh and a pure white edge highlight. Celestra (or whatever it is) is another option, mine is a warmer brown/white and the Celestrwhatever is a colder blue/white reality.

To show you how much patience I have for painting, here's 5 Sternguard I built today instead of even looking at a brush:

Unfortunately Canada got rid of the penny and now my two cents rounds down to zero, so...take it for what you will.